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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df66c39ca2827212730ff7c0e1b6217e77d4038f47da3099d174e4fc6c747ded' 
  AND token = 'hlaMkMjRFZ/GA6QMh0b/YdfgkvV89dWM18AzVC+Jamo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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