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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8626fdde1aeeb30977d588e87bed75062511893379f2cb5ff39a9cc459d573' 
  AND token = 'nurf3s+dGSjF/D/MyQYI3QEIDvGZrZ/vX0OOfIlcqDA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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