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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a6115a0e6d554690a563f550b8ed7e321196790625710f72c107bbeab122e22' 
  AND token = 'AOEYez9j/H+z+Cpzjq3SgX442/D/KwYeD8FIP45YeA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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