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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edcd1ab0e43f47f3df262e86e8b8f2c0e00c3ab55d7811faada8003e729f7139' 
  AND token = 'wVUhjWKm6HzK36oVSanlRLbL/nyfMh8OvK7tn4nrGsU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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