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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ad02537d8fcdbb79abd4f57024ae9e29b5427d1590bfd627a22446048671bc4' 
  AND token = 'XHZjsmVC7afmAx63ad+iSSadBke3e9EvQt6D2qn6YEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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