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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42093dba88019fb16b0591e33bd21b4520349294f9c42f5fe8371381ed75bb8c' 
  AND token = 'cvQg5ObO3gJIiKjoAV+MKSf52KN2lI7V39n7TbmInqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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