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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fdd3461c0c8006c6f5a44531f765e7bc41bd64804a009c404223a487e2efa2b9' 
  AND token = 'O7VcQi4A8f500Na/83RgCvjLrWwgoBEaBtteHq1uzbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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