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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66a7807c74ad534a09fcd95cc740e05640746271697b902f5dc4806259d74131' 
  AND token = 'eUMqh4rfC2QA1RnhIO8yVjG/P+8JqzSPP8qkBPfrUs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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