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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdf784f208ec73a621940ccd1ab00c56213954e4b0721172d1093b0bbe9e64e6' 
  AND token = 'NcbYL576UniHmj3SzbD7QJtmdEYYq6+FNjJ0/enqonk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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