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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f0a79a62dd82f5d678360b30ee963593403bfde28a4e6c77b9ddd66361220e' 
  AND token = '3aJAIAQ8fXg8Y6NcrCV8Ca/0v6O37fwGIdZ6gbFDaLc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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