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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '067aa15d6906de684def12000e87ba44694973e8d618f9b43d7435a22e3a235c' 
  AND token = 'ijfDhaMM9uelgDr2MtUl71lN9zlQqyAxZ/p3qqDZjY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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