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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce3c06eb91c31513a3d41199a66b7dc48428716c0d664f0851b86f021ce93bbc' 
  AND token = 'UABjFAmXxanRaWkJkKTwY9qbiVl67//TpqnktN9UgKc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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