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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acee3e29dca49222dab62edd206ebae03caacf1409dfa5f8fa5f4c64f6802a2a' 
  AND token = 'sgg0uiwmiKp5vuXksyfDBZelnp/d6/bOFElBm4nhyko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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