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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85e2088475a8661a7b749f3e8a3e869c22f815a359414d186f8be4d4da7758f8' 
  AND token = 'Khny0vQqgJiN2xcTfNr1cU9SiqX+2OpvphsalSC8W+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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