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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40bb5c14235c96c9e810277328dd4d5968cbd3ec963cbb424e0d581f876d2dca' 
  AND token = 'boPIBZerCA+LksgDhC2vFW7Mye598vbdppW7hoJ/GqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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