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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c99694d2a18cb00a37487ae5d5f5d19977cf2dc3c0c4beb7e5a26c2e0ca4d3' 
  AND token = 'tjPys35hikCbpbBSw9LJyj+mXF+ObOEVM/77iqPaU3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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