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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67529e5d2a6841876f3a24afada04302c4906d6fb2391afc837ad0e41ad58b54' 
  AND token = 'wQ/0SrqH2+x7inVq+weyFWe9Csllojk/t9Ana3Gxubc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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