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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632529eaf3dc5bf033677872b17c857b07dcf6d7acd3a8222df3bd786335c5b9' 
  AND token = 'AqrRHYndVPkVvl0amB7PZy3I8r1Le2naSItnUoQbTTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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