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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94b5aeb0aa3adc16ebcbcd73a2c1e01dd00826f4b4cbb1f243f9488bd6fecbba' 
  AND token = 'e0qnAHTDYg+1xaHmx2HYXDIidoRcpKROaf7j2hc+JEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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