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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21bd0885ba8922a6b60bb869be733df219465397b807166375bee3402765e162' 
  AND token = 'VAHh0kNFgBc9YdwDSRn+HMF/3dbCi9ybddZog/i8QN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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