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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96db878112028ad202062034ec2f750a9f8b670a52e7c4012579358bb72fed95' 
  AND token = '53IPLg7/y2ICy4yRZmKq82Fzzq98PG2c413y4ZDxCJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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