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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e3144773e1bca64f77c72f60607d1792c7ff2fe5e6919d8b4ed75c8ee1c8ff1' 
  AND token = 'Z6VQgy4agu2DlKjYo5rvfvIeF+4rBHl7erj5m2LzgE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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