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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e930f186008597b3ffda652484b3878536d52cde31c6358441cd9e76517f105c' 
  AND token = 'fbV36s/BOqh2FzJNERD+EUSmt0Z5TISOyl+WJfbUIs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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