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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '135447e5e8c9bbcfe5a7c961e58807d9c397d54c7af750e5e5d1088132d44f9f' 
  AND token = 'LD7qk7GYC3kXEJtxe0vtebOHFFG2otYNOl8/DEvi1pI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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