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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b57631590dd71783170d6a90b09edac630141f2120f4f2b54a317b3ab0f78c30' 
  AND token = 'Mov2wShzNt+G7wODBxX1bexFzz18MmhG7iAIsOx3Zc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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