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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f5e4a5b11d32a4c185ed5e3975004c74dbb8d8da33e00915f2a54fecaa3e68' 
  AND token = 'QfKpWx22p2amtLa6THQ/gIj7Np31qpPwU8oMr7T96/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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