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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1ffa27d4b1b7747ffc49d7ff4d13fc10210a7ccc534296ee76fd4025f8575d6' 
  AND token = '147y6leyqyW8QzkUa2gAvSIlnimDZvTmi1+uqvwwxxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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