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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9643c861d84283f016ac9ff6bfc1b034f3b142e5bbfc125d86e0de28e66c92e9' 
  AND token = '/X0qgws3dujzilAVglCdTWN24xv3VzmGzHUs6yA3kyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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