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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1891ec31da6216aa86653682f9b251d19df4e2ba197597c5b0e9acbc9838c56' 
  AND token = 'FjMDjjG6WUiS4COOr+xBVGEM+z26q65HqvV8DLERO4Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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