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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd694195fb70ee237d327fd3b88e7428cbbf0a043ca103926e2b41c9ebfc1659' 
  AND token = '62sjD23EIsIxpVlciXeOLRFmCr4aAUtHwg90BCJKFXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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