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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fdb2ba7c95933b7b5eb70509a1149d7dbb58652675ef0b36a0a5b76a914c1fa' 
  AND token = '6i2vJwd/z8uGYgxebfpVW42/wvQ4pY6OPZt8i1tVzzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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