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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb1e1e34f9ef4ac0b37c4f28e0e5cc2008adcf37dd09fe07bb788bbc6807aa1d' 
  AND token = 'EwuIzms1uOKQFKtJ5D6QPYltpTGI46PbpJ61km1p7f4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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