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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b5341cf0713d698210c60bf0f43d33afe915d5ada1b625df223b3556628d246' 
  AND token = 'OiRFEOiEy/qXSKIDr19YRfWegalWDjpk8xh2LwGf3YY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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