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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d8bd1d1513dfc537d89b3b55dedfc165d2bac8b6c0d4f24464b70ece90b4294' 
  AND token = 'XFUP4IkWhSiuFeP1nOi4RAv53AmQ6ouo74fhoirZCUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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