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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66bb71236a80eac2ab7ead4873793353fab7d8fce40b39ab1cd6753ce1aea2ef' 
  AND token = 'ayA0zki3GBa6aVwJXnIR8MU3++v9mdp4lEhILV9wiG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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