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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ebd533020c17e2bb27ac2687c52fad04aac3711a1286e1ce5e0fb0b9182d04b' 
  AND token = 'BzmIroqIJlN2FkCGvT90k4ZFjHfCVBa1ZoOfbiML0I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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