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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08ccfdf1938b4d67d97091894f376125396d93396c7fd8bf5b497d55f52e676' 
  AND token = 'i4krJZdce4h6rS44m9as/MRyFpbLqFdiL4kp/8DehI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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