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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7361310fdf54be1d625c5a2991cdbe78b332033ab4afa821b8aa8c1c5a50913f' 
  AND token = '6kKQGekLpMG9sVjsvCbKwGGZu1H8+2uIQqdmOFsewEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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