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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e570a3ae2adb49bc2f453dc0cc903b877f9a3390c67a467863616cff080937b0' 
  AND token = '4Y0jpGKsGOKN2EUaGyRd4LEbrsDHs58ANajekImnIJA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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