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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '324f13caef8057ae76e70fa4f7f68d2373ba95d6e155ec3c3945625a319ff352' 
  AND token = 'W2d08e9C8lvV9jQd+swTp7trNUcF2RWjoilq/Wn9eUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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