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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1912aa53518b2125b0bd3633ba0a237add314a452bfbbc50f111d91f06bf44cc' 
  AND token = 'vODDcDIxBYiyoRCmVC1sh1eALprluvuxoMashdapc1g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}