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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e25744975796508f9856ba078d8d6137591954e10cc33fe84dc8426d4037200' 
  AND token = 'yb+HDvlCsSAXxsoEjbjuA90OGBrJSCc+mkefW72BElA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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