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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4270c5e83f4890b22051ec2ebbbc8eceda231d337664d09dfa666f5ca975673' 
  AND token = 'HDqxVgMKrO2Mckl4J9xhceKjLjsjvlPSmjRJkM9LX28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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