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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67bf395947ed82f39de0bf0f3b55c35accd7a1704bcd2ed4582293eac969689d' 
  AND token = 'ERs/NhwTWLz7ZKchuw7p+M4JNqfVX9UT1YRMcsf17y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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