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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8256c0b48337eea337a48ac71846496f7b76d00d0c10a02db5276fb9c700e1' 
  AND token = '2l77vmyJ02haCYJeWvaGW8EoqKS/qcpBltMO3DLgpkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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