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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3727fd536a09184fb816999a9758c1dc20562cea613eb2a2824d1eca45a31a31' 
  AND token = 'fmGkZNgveWVGnO5NOE46JF+93GkgQofyDZ2nLroKWIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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