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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b263d1bc021b5d100eb41ba91116bd37a0ce4dbe987739af36e42c1f369b3e0' 
  AND token = 'ODyVXP2w0/8doU3z0Yi3uxX/xpXTfEVjib7eGtfLyok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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