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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc2e4b6dc6d81e02610e057c877f4f0d4b8f53bd5002ed1dc60e912702a34d7' 
  AND token = 'i3ChRM2TQnroW+z4ojfHH2FWD7mYY0AEjl1+x1Ek268=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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