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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6911943e7e61652a0cd2b7a3c3a262455826d8b60f8532569122f8307f9a7bc' 
  AND token = 'kGP2wtdvIKosMwYp8RSYBPc6N+YU9r3qtat/wjvSfbE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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