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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3713caf420e1bc9d35d9cea3e2c7a76b2c9cd5afe5f8aba01544cc6c89f53f35' 
  AND token = 'yPxok9MLUwtZywq4o7/iz3onUsCovAwVfVs7Rkj30qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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