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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76c64d3636b2543f006a1f0c43d101ab049d3a6fb953b890e279b2e6f71a7fed' 
  AND token = 'Mob5ntN9wLNO4cZBlf73ithVBpQnVnmkL4XiaHbDYHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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