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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97afbbca98f97328f2155c47daba8a84d67c77cfd4821a0e30b634d26f293f4d' 
  AND token = 'NwnG2J5vEN+6E90PB9ftfayi/SP1l2KhdrZPhG/t6RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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