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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418da60c0be5bc26118fca3b3deaf57befc7d7666e6fcc1a7c68c18ef5130d07' 
  AND token = 'PQgFO32dv1dIu+swJrfcsr2OKQCHTtaDArv6jxIi+GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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