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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb44f051e871c503c514a728fc33f961073c0fe56ef72a8cbcbe19705fcf7e44' 
  AND token = 'Wu0zvJV5vvRu1n2rjM902e1UqcwyH9Oc5khuWjjjrAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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