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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bda02d8c409eaadf0e7e0acda872d19dc69d25718beedf5c5364ec3284c0e2b2' 
  AND token = 'ewzs45qbg69t5jkt7ydmCy9r3NJdpGZqZYVLHDvELZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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