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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a90a4ab93f7428eb7947890a17c6ae78b1e09db29a9dd37b5f57814b4d571df' 
  AND token = 'xtxXyUKwBiTFTSWmDXUWKfxGwL8fruiM/OLomit+RLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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