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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f70937166522a3e310c4a0aa7a56d36d667cf9082691b06e6e71e85e1f800f7' 
  AND token = 'zuVzYrceecCxPJ7H6CKnUEdBjk9U3RE33/AdPu+nPzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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