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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20e12db9da2178950e7761211d45a0ed165eae09c2da1ee91c1c8a69dd864a9' 
  AND token = '5Gh9QRZEZwHqu2TY+csTLp4ElGbcIuCoNzt+Y2mgznc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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