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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb13a5992362fd4fa8535186e3a755525ccefe46ac7223c80594422230242cc' 
  AND token = 'g65Tonu+KtESNJoDqsHUSMGW+GeAZww7f+9H6XFG5D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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